Method and machine for forming radiator-core sections



June 3 K924 3,496,393

P. K. TOPALE METHOD AND MACHINE FOR FORMING RADIATOR CORE SECTIONS Filed y 51. 1925 5 sheets-sheet) gwuwnfoz June 3, 1924. 1,496,393

; P, K. TOPALE METHOD AND MACHINE FOR FORMING RADIATOR CORE SECTIONS Filed Mai," 31. 1923 5 Sheets-Sheet 2 June 3, 192%. 1,496,393

P. K. TOPALE METHOD AND MACHINE FOR FORMING RADIATOR CORE SECTIONS Filed May 31. 1923 5 Sheets-Sheet 5 gjwuudoz 61th:: nut:

Jun 3, 192%. 1,496,393

P. K. TOPALE METHOD AND MACHINE FOR FORMING RADIATOR CORE SECTIONS Filed May 31. 1923 5 Sheets-Sheet 4 .v mil"; I

June 3, 19246 P. K. TOPALE METHOD AND MACHINE FOR. FORMING RADIATOR CORE SECTIONS Filed Ma}; 51. 1923 5 Sheets-Sheetfi Patented June 3, 1924.

UEWTED STATES PETER K. TOPALE, OF PHOENIX, ARIZONA.

METHOD AND MACHINE FOR FORMING RADIATOR-CORE SECTIONS.

Application filed May 31, 1923. Serial No. 642,657.

To all whom it away concern:

Be it. known that I, PETER K. ToPALn. a citizen of Russia. and resident of Phoenix, in the county of Maricopa and State of Arizona, have invented certain new and useful ln'iprovements in a Method and Machine for Forming Radiator-Core Sections, of which the following is a specification.

This invention has reference generally to improvements in metal working machines and more particularly relates to an improved method and machine or apparatus for making radiator core sections such as of the type shown in my copending application Serial Number 419,891, filed October 27, 1920.

The invention has for its primary aim and object to provide a method and machine for continuously forming radiator core sections which consists in intermittently feeding a strip of suitable sheet metal between suitable pressure applying means, so as to corrugate the same or more particularly give the metal an alternate U shaped channel formation in cross section, then exerting pressures on op- 'posite faces of the metal during idle periods to form water grooves or channels in certain portions of the metal and finally automatically cutting the shaped metal into sections, desirably of predetermined lengths.

As an additional and equally important object the present invention embraces the step of centering and yieldingly holding the metal strip immediately prior to the forming of the grooves to insure of the proper formation of the latter and preventing accidental shearing of the metal. In the machine for carrying out the method the guide or setting device for effecting the foregoing object constitutes one of the most important features since it insures of an effective operation of the machine as well as an effective production of the article with a minimum loss of material.

The invention also includes the provision of a machine or apparatus for carrying out the process of continuously forming radiator core sections wherein the pressure applying meansand cutting means are operated in synchronous relation.

More particularly the present invention consists in the provision of a machine for carrying out the said process which comprises generally means for applying pressure on opposite faces of the strip of sheet metal such as coacting grooved or toothed rollers which also act to advance the strip; means for intermittently actuating or rotatingthe rollers; means for centering the corrugated strip; means such as relatively movable die members actuatable during idle periods of the feeding and cutting means actuatable in timed relation with the operation of the other parts to cut the shaped strip into sections, preferably of uniform lengths.

Other objects as well as the nature, characteristic features, and scope of the invention will be more readily understood from the following description taken in connection with the accompanying drawings and pointed out in the claims forming a part of this specification.

The improved machine or apparatus for carrying out the method is clearly illustrated in the accompanying drawings, in which Figure 1 is a diagrammatic elevational view showing the various successive steps of the novel method for continuously forming the radiator core sections.

Fig. 2 is a side elevational view of the machine or apparatus for carrying out the method.

Fig. 3 is a front end elevational thereof.

Fig. 4 is a rear end elevational view of the machine.

Fig. 5 is a fragmentary perspective view of the machine showing particularly the secondary pressure applying or shaping means in the form of relatively movable dies as well as the cutting means.

Fig. 6 is a vertical sectional detail view through the head which carries the upper or movable die and the operating means for the head.

Fig. 7 is an enlarged horizontal sectional view taken on line 77 of Fig. 2.

Fig. 8 is an enlarged fragmentary vertical sectional detail view through the cutting means, parts being shown in elevation.

Fig. 9 is a rear elevational detail view showing particularly the means for effecting intermittent rotation of the rollers.

Fig. 10 is a side elevational detail viewview of the lower die and the stripper plate therefor, only a. portion of the block being shown, and,

Fig. 16 is an enlarged sectional view of slightly modified form of the toothed or grooved rollers which effect the feeding and shaping of the material into the alternate U shape channel formation in cross section.

Similar characters of reference are employed in all of the above described views, to indicate corresponding parts.

Referring now, more particularly, to the accompanying drawings, especially Fig. 1, wherein there is illustrated diagrammatically the preferred means for executing the various steps for forming the improved radiator core section, the numeral 1 designates a relatively flat strip of sheet metal which may be drawn from the roll or the like (not shown) which is drawn through suitable pressure applying means such as toothed or grooved rollers 2 which act toadvance the material and alter its cross-sectional shape, so that it will have an alternate U shape channel formation as shown at 3. The material is advanced preferably intermittently and so that one channel will be formed during each advancing period. A suitable guide, generally designated by the numeral 4, coacts with the movable die member 5, so as to center the material between the die member 5 and the coacting member 6. These die members 5 and 6 are preferably formed with two sets of groove-forming portions but as the material only advances one channel during each revolution of the main operating shaft as will hereinafter more fully appear, only one channel portion is stamped or has pressure applied thereto for the for mation of a groove therein during idle periods of the feeding of the material so that the material will have finished shape as indicated by the numeral 7. In other words, first set of groove forming portions of the die members 5 and 6 serve in the present instance as an additional pressure applying means and act directly or positively for forming thewater grooves 8 in alternate channel portions of the material, while the second set of groove forming portions coact with the centering guide in properly holding the material and also act on the previously formed groove 8 to insure of it being of the proper shape. Suitable cutting means, generally indicated by the numeral 10, act preferably at predetermined intervals to sever the finished strip into sections desirably of predetermined lengths.

The preferred machine or apparatus for carrying out the novel method of forming the radiator core sections will now be described in detail as follows:

A base plate 11 has mounted thereon pressure applying means which consists of space standards 12 provided with opposed vertical slots for accommodating bearing-blocks 14 for the trunnions of toothed or grooved rollers 2. The upper blocks 14 have associated therewith adjusting screws 15, the upper portions of which are mounted through a cover plate 16 secured to the standards and are held in proper adjusted positions by suitable means such as nuts 17. A. laterally disposed platform 18 is connected to the front or inlet side of the pressure applying means preferably at a point between the toothed or grooved rollers 2 and this platform is fitted with a guide 19 for insuring of the proper spacing of the strip of material 1 between the toothed or grooved rollers 2. Intermeshing gears 20 are fitted on the front trunnions of the rollers 2, the hub of the lower gear being rigidly secured to the trunnion of the lower roller while the hub of the upper gear is formed with a slot 21, the portions on opposite sides of the slot adjustably receiving suitable means such as set screws 22 for coacting with a lug 23 formed with the adjacent projecting trunnion of the upper roller, the purpose of the arrangement being to properly arrange the teeth or grooves of the rollers with respect to each other so as to ultimately insure of the effect ve forming of the alternate U shape channel portions in the strip.

Suitable means for intermittently rotating the rollers to insure of a corresponding feeding of the strip of metal 1 is generally indicated by the numeral 24 and will hereinafter be more specifically described.

Another platform 25 extends laterally from the ejecting side of the pressure applying means being preferably connected for slight vertical swinging movement for a purpose which will presently appear. This platform is fitted with a removable cover plate 26 which coacts therewith in forming a guide for directing material between the additional or secondary pressure applying means.

In reducing the additional pressure applying means to practice there is provided a frame which includes a body portion 27 secured to the base 11 and including spaced upright standards 28, the upper portions of which are offset forwardly and consist of guides 29 terminating at the extreme upper ends in bearings 30 for a shaft 31, the

latter being properly supported in the bearings in 0011]].1I1Ct1011 with bearing plates 32. The medial portion of the shaft between the bearings is cranked as at 33 and has associated therewith an adjustable sectional rod generally designated by the numeral 34 for the head generally designated 35. This head is reciprocated vertically between the guides 29 by means of the rod and the cranked portion 33 of the shaft. The rod preferably includes two sections, one of which is partly tubular as shown by 36 being connected with the cranked portion 33 of the shaft by a bearing plate 38 and is adjustably connected with the other section 39 I -or polished web 42 formed integrally with and transversely and vertically between the guides 29. In this connection it may be added that guide plates 43 are preferably se-,

cured as by suitable fastening means 44 to the front faces of the guides 29 and overlap the reduced vertical marginal portions of the front plate 41 of the head, so as to facilitate the smooth working of the head. In manufacturing the machine, if desired, the plates 41 may be formed with the head while the plates 43 may be formed with the guides. The lower portion of the head is enlarged as shown at 44 and is formed with a dove-tailed groove 45 for receiving the upper or movable die member 5. Suitable retaining plates 46 are removably connected with the end edges of the enlarged portions of the head to insure of the retention of the die member in position in the head. This die member preferably consists of a body portion 47 having spaced recessed portions 48 therein, while longitudinally of the bottoms of the recesses are formed projections 49, the outer edges thereof being curved longitudinally as at 50. These projections are adapted to facilitate the formation of the water grooves 8 in the metal strip in a manner that will presently appear. This die member is fitted with a slotted stripper plate 51 which is held toward the lower or working edge of the die member as by suitable resilient means, such. as coil springs 52. Cooperating with the upper movable die member 5 is a lower stationary and complementary die member 6, the latter being secured transversely in a block 53 arranged forwardly of the body of the frame 47, but immediately adjacent thereto. The lower die member includes a body portion which may be of dove-tail shape and which is preferably secured as by a wedge 54 in a corresponding transverse groove 54 in the block. The body of the lower die member 5 is desirably formed with spaced projections 55, the outer edges of which are formed with longitudinally curved bottomed grooves of less size or area than the surface area of the projections 49 to coact therewith in forming the water grooves 8 upon the downward movement of the head carrying the movable die. Coacting with the lower stationary die member 53 is a stripper plate 56 somewhat similar in construction to the stripper plate 51. Guide bars 57 depend, from the end portions of the plate 56 and are slidably arranged through apertured lugs 58 on the front and rear faces of the block. In this connection it may be noted that the web 42 terminates approximately in alignment with the lower edge of the plate 43, which of course leaves a space between the standards 28 rearwardly of the block 53. The stripper plate is held in a position slightly above the upper face of the lower die 5 through the instrumentality of a lever 59 which is pivoted on the front face of the block as at 60, rocking movement of the lever being limited by stops 61 fixed on the front face of the block. This lever 59 is formed with a plate engaging lug 62 at a point near its outer end, while the extreme outer end is formed with a laterally offset and slotted lug 63 which operates about a tensioning device generally indicated by numeral 64. This tensioning device includes a rod 65, the upper end of which is fastened as at 66 to the front retaining plate 46 of the head, while a coiled contractile spring 67 is arranged about the lower portion, one end of the spring bearing against the under surface of the slotted lug 63 while suitable retaining elements such as nuts 68 are engaged on the lower end of the rod, and by this arrangement it will be apparent that when the rod is raised, causing the spring to engage and raise the lever,the latter will correspondingly raise the stripper plate 56 to the normal position shown in Fig. It is likewise apparent that on the downward stroke of the head that the rod moves downwardly therewith, relieving the tension of the spring on the lever and permitting the latter to move downwardly, so that the stripper plate will pass into the lower die in advance of the material and be in position to remove the material immediately subsequent to the stamping or shaping thereof by the coacting die members. In con nection with the foregoing it is to be noted that the outer edges of the platform 25 are in-turned and slightly reduced soas to rest upon the end edges of the plate 56 as shown at 69. Suitable means are employed for yieldingly holding the platform 25 on the plate 56 in the present instance consist-- ing of coiled contractile spring 70. A guide 71 is positioned on the opposite side portion of the stripper plate 56, the attaching portions thereof being secured as at 72 to the end portions. This guide prevents the metal strip from being forced too high after being ejected from the lower die and also guides the material under the cutting means which will presently be described. As intimated the materialis fed intermittent-l preferably the distance of one of the teeth or grooves of the rollers 2 while the head reciprocates once during every revolution of the shaft 31 so that the upper portions of alternate channel portions of the strip are pressed by the action of the dies to form the water grooves 8' therein. 1 r

In order to insure of the proper formation of the grooves and to prevent shearing of the metal strip means is employed for centering the corrugated strip immediately prior to the action of the dies. The preferred means for reducing this feature of the invention to practice consists in the provision of the centering means 4 in the form of a plate-like body 73 having a plurality of vertical slots 74 therein, through which are passed suitable fasteners 75, the latter being engaged in the side of the head toward which the material is being fed. A channel portion engaging head 7 6 is formed along the lower longitudinal edge of the plate-like body 73 and this head, together with the plate are held downwardly in aposition normally about an inch or so lower than the lower or outer face of the upper die member '5, preferably through the instrumenta'lity of resilient means such as coil springs 77 interposed between one side of the head 76 and the under surface of the enlarged portion 44 of the head. This device acts to automatically shift or adjust the corrugated or alternate U-shape channel portions of the strip into proper alignment with the first or main set of groove-forming portions of the die members 5 and 6 so that when the latter are actuated the grooves will be properly formed in thesaid strip.

With a view toward providing suitable means for cutting the strip subsequent to the formin of the water grooves 8 therein and desirab y into predetermined lengths, one of the guides 29 is channeled vertically thereof and rearwardly of the adjacent guide plate 43, while vertically slidable in this channel is the stem or shank 7 9 of a cutter head 80 which latter is fitted with a cutting blade 81. The head is normally held in a raised position by suitable means such as a coiled contractile spring 82 one end of which is connected as by an eye bolt 88 to the upper end of the shank of stem 79, while the upper end is connected to an inverted and threaded eye bolt 84 with which eoacts a nut 85 positioned on the upper part of the guide as shown in Fig. 8. A suitable stop in the form of a bolt 86 is anchored in the upper portion of the shank and works in a vertical slot 87 in the plate 43, the latter coacting with the bolt in limiting the upward and downward movements of the knife blade 81. For the purpose of actuating the knife at predetermined intervals a lever 88 is swingably arranged at its inner end about the stop bolt 86 and is normally held in a vertical position against a lug or stop 89 on the front face of adjacent guide plate 43 by suitable resilient meanssuch as a spring 90, the respective ends of which are secured to one side of the pivot point of the lever and the head 80 of the cutter. The lever 88 is designed to" be moved laterally on the front face of the plate into the path of movement of the lug 91 carried on the front face of a carrying plate 92 therefor and which in turn is connected to the front face of the plate 41 of the head, so that when the lever 88 is moved into the path of the lug 91 the downward stroke of the head causes a similar downward stroke of the cutter head so that the'blade 81 thereof will coact with a stationary cutter blade 93 arranged transversely of the block 53 and thereby sever the material. A stub shaft 94 projects at right angles from the ejecting side of the arm 27 and has rotatably mounted thereon a notched disk 95. A lever 96 is fulcrumed medially of its ends as at 97 one end thereof being formed witha notch engaging tooth 98 while the opposite end pivotally supports the inner end of a finger 99, the outer portion of which rests on the upper surface of the lug 89 and terminates immediately adjacent the upper end of the lever 88 when the latter is in its normal position, so that when the notch in the disk moves into align ment with the tooth 98 of the lever 96 the lever will be shifted under the action of a spring 100 causing the tooth 98 to engage the disk and at the same time causing the finger 99 to move the lever 88 into the path of movement of the lug 91, so that the cutter will be actuated. It is desired that this cutter actuate for instance at the forming ofevery 24 grooved channelled portions and in accomplishing this action a ratchet wheel 101 is mounted on the shaft 94 so as to move' with the disk 95 while an arm 102 is loosely connected to the shaft 94 and pivotally supports a pawl 103 which is yieldingly held in engagement with the ratchet wheel 101. A gravity operable pawl 104 is pivotally mounted laterally of the ratchet wheel and engages the teeth thereof in the manner shown in Fig. 4 so as to prevent reverse movement of the wheel during the action of the adjusting pawl 103. This adjustment is preferably effected through the instrumentality of a rocking link 105 actuated by cam 106 from the shaft 31, a link 107 serving to connect rocking link 105 with the axis of the pivot pawl 103 on the arm 102, so that during the rotation of the shaft the ratchet wheel and consequently the disk will be partially rotated a predetermined distance. It is to be appreciated that the parts remain in the position shown in Fig. 2 during the formation of the material and several actuations of the die members and onlyactuate 1,4ee,ees

the cutter at the time the lever 96 engages the notch in the disk 95.

A latform 108 is arranged laterally of the b ock for receiving the cut sections.

As previously intimated, means have been provided for intermittently actuating the rollers 2 and in order to advance the material the distance of two teeth or grooves in the rollers at each revolution of the shaft 31 and in accomplishing this purpose, a disk 109 is mounted on the shaft 31 on the end opposite the fly wheel 110, and is eccentrically connected with a rocker arm 111 on the frame 27 by a connectin rod 112, the inner end of which is adjusta ly mounted eccentrically of the outer face of the disk by adjusting means 113. The opposite end of the rocker arm 111 is operably connected as by the link 114 with a bell-crank lever 115, in turn operably mounted on the rear trunnion of the lower roller 2. The other arm of the bell-crank le'ver has a spring pressed pawl 116 pivotally connected thereto for coacting with the teeth of the ratchet wheel 117 carried by the lower roller 2. By this arrangement it will be apparent that the rollers 2 will be rotated step by step or intermittently and the strip desirably advanced the distance of one tooth of the rollers during or with each revolution of the shaft 31, as apparent.

The mode of operation of the machine for carrying out the method of continuously forming radiator core sections may be reviewed as follows:

The rotation of the shaft 31 effects a rocking of the arm 111 through the pitman rod 112 so as to corres ondingly actuate the bell crank lever 115 w ich by reason of the step by step action of the pawl 116 mounted thereon and engaging the ratchet wheel 117 intermittently rotates the lower roll or roller 2 and through the instrumentality of the intermeshing gears both rollers are rotated toward each other to draw the strip of metal 1 therebetween and apply pressure thereto and corrugate or form the alterate U-shape channels 3 therein. Of course this intermittent forming of the corrugations or the like intermittently advances the strip 1 which latter is guided beneath the coacting die members 5 and 6. As apparent in the present reduction to practice these die members are shaped to act on two spaced and .inverted channels, that is, the upper die member 5 moves downwardly once during each revolution of the shaft and coacts with the stationary die member 6 and applies additional pressure on the corrugated strip to form the water grooves 8 in two adjacent inverted channels 3, but as the material only i advances the distance of one channel portion during each revolution only one groove 8 will be positively formed during each reciprocation of the head. In other Words each groove 8' is formed by the first set of groove-forming means in the die members 5 and 6 and subsequently moved and acted on by the second set of such groove-forming means. This record set acts to insure of the proper shaping of the water grooves 8 and in addition coacts with the centering device 4 and holds the material during the positive forming of the grooves b the first set of groove-forming means in t e dies. It is appreciated that the centering means or device 4 acts to first properly align the corrugated or channelled portions 3 with the die members 5 and 6 to insure of the proper forming of the grooves 8 and prevent accidental shearing of the strip 1. It is also to be understood that the die members act during idle periods of feeding of the strip by the rollers 2. Finally at the time the lever 97 engages the notch in the disc 95 which is rotated step by step from the shaft 31 by the described operating means, the finger 99 is moved against the lever 88 to position the latter in the path of movement of the lug 91 which latter is carried with the head 35 and consequently effects a downward movement of the cutter head 80 so that the blade 81 thereof will coact with the stationary blade 93 and sever the completely formed strip into sections of predetermined lengths. As apparent from the foregoing these predetermined lengthened core sections are I formed continuously by the machine or apparatus.

It is believed in view of the foregoing that a further detailed description of the invention is entirely unnecessary. Likewise it is believed that the advantages of the invention will be readily apparent.

Having thus fully described the invention what is claimed and desired to be secured by Letters Patent is 1., The method of continuously forming radiator core sections consisting in intermittently feeding a strip of relatively fiat sheet metal and simultaneously applying pressures on opposite faces of the strip to corrugate the same, then temporarily and yieldingly holding the corrugated strip and simultaneously applying additional pressures on medial portions of certain of the corrugations to vary the cross-sectional shape of only the medial portions, and finally cutting the strip into sections.

2. The method of forming radiator core sections consisting in simultaneously applying pressures on opposite faces of a relatively flat strip of sheet metal to give the metal strip an alternate U shape channel formation in cross section and intermittently advancing the metal strip, then yieldingly holding and centering the metal strip and simultaneously applying pressures on opposite faces of certain channel portions of the strip during idle periods of the feeding to ti l form water grooves therein and to also vary the cross-sectional sha e of the medial portion of the strip, an finally cutting the metal strip into sections'of predetermined lengths.

3. A machine for carryin out the described method of forming ra iator core sections, including a pair of coacting grooved rollers for corrugating and feeding the strip of sheet metal, means for'aplplymg an 1ntermittent rotary motion-to t e rollers, coacting die members between which the corrugated strip is fed, and one of which is .movable relative to the other so as to act on the strip during idle periods of the feeding thereof to form grooves in alternate corrugated portions of the strip, means associated with the movable die member for setting and yieldingly holding the strip during the actuation of the die members for preventing shearing thereof, and means for automatically cutting the strip into sections of predetermined lengths.

4. A machine for continuously forming radiator core sections including intermittently operable pressure applying means for corrugating and feeding a strip of metal, die members one of which is movable relative to the other during periods of rest of the feeding to form grooves at spaced points in the corrugated strip, a vertically actuable and temporary holdmg and centering device for the strip coacting with the movable die member, and means for cutting the stri 5. A machine as claimed in claim 4 w erein the centering device includes a plate-like body slidably and yieldingly mounted on the side of the movable die member and an elongated corrugation-engaging head formed along the lower edge of the plate-like body.

6. A machine as claimed in claim 4 wherein means is employed for operating the movable die member in timed relation with the actuation of the pressure applying means including a rotatable shaft having a cranked portion, a head for carrying the member, and an adjustable sectional rod between the head and the cranked portion of the shaft.

7. A machine as claimed in claim 4 wherein the cutting means includes a stationary blade and a movable blade, a head for supporting the movable blade, a shank projecting from the head, means for normally and yieldingly holding the shank in a raised position, and means for effecting a downward movement of the movable blade toward the stationary blade at a predetermined time.

8. A machine as claimed in claim 4 wherein there is provided a rotatably mounted shaft, coacting means between the shaft and pressure applying means for eifecting intermittent movement thereof, coacting means between said shaft and said movable die member for effecting a reciprocal actuation eeaaea of the die member during the successive periods of rest of the pressure applying means. 7

9. A machine for continuously forming radiator core sections including a rotatably mounted shaft, pressure applying means for corrugating a strip of metal, means between the shaft and pressure applying means for effecting intermittent movement of said shaft and feeding of the said strip, die members one of which is movably mounted, coacting means between said shaft and the movable die member for effecting a reciprocal action of the die member during the successive periods of rest of the pressure applying means, a vertically actuable centering device for temporarily holding the strip coacting with the movable die member, and means for cutting the strip at predetermined intervals including a vertically reciprocable cutting member, coo erative means on the cutting member and t e movable die member for coupling said members, means operable from the shaft at predetermined periods for effecting coupling engagement of said cooperative means to insure the cutting means operating at a predetermined period, and means for uncoupling said cooperative means.

10. A machine as claimed in claim 9 95 wherein the cooperative coupling means includes a resiliently controlled lever pivotally mounted on the movable cutting member and normally held in a vertical position, and 2. lug carried with the movable die member 100 and with which the lever is engaged at predetermined periods.

11. A machine as claimed in claim 4 wherein yieldingly mounted stri per plates are associated with the die mem ers.

12. A machine .as claimed in claim 4 wherein there is provided a rotatably mounted shaft, coacting engaging means between the movable die member and the cutting means, and independent operating connec- 110 tions associated with the shaft and respectively associated with the pressure applying means, the movable die member and the cutting means for operating all of the means in synchronous relation.

13. A machine as claimed in claim 4 wherein the pressure applying means includes rollers in geared connection with each other and means for adjusting the teeth of one of the rollers with respect to the teeth 120 of the other roller.

14. A machine as claimed in claim 4 wherein upper and lower stripper plates are associated with the die members, means for yieldingly mounting the upper plate, a lever 12 for association with the lower plate, and a tensioning rod between the upper movable die member and the lever, substantially as and for the purpose set forth.

15. A machine for continuously forming 130 radiator core sections including intermittently operable ressure applying means for corrugating and feeding a strip of metal, die members one of which is movable relative 5 to the other during periods of rest of the feeding to form grooves at spaced points in the corrugated strip, and a member mounted resiliently 0n the advance side of the movable die member and vertically movable with respect thereto for yieldingly engaging and 10 holding the corrugated strip during the operation of the die members.

Intestimony whereof I hereunto aflix my signature.

PETER K. TOPALE. 

